Not to beat a dead horse but as many here have noted, relations between the USA and our dear neighbor to the north have suffered greatly recently, with one consequence being a "softening" in demand for travel between the US and Canada. Some airlines running US-Canada/Canada-US flights have already begun reducing flight capacity to try and keep up with the evolving demand. There are some new numbers out today from an industry group that suggest demand for such flights are absolutely cratering, with flight bookings in the coming months dropping 70-75 percent.
OAG: Canada - US Aviation: Airlines Respond to Weakening Demand
The gist:
Future flight bookings between Canada and the US have collapsed.
We've compared the total bookings held at this point last year with
those recorded this week for the upcoming summer season. The decline
is striking — bookings are down by over 70% in every month through to
the end of September.
That is a collapse that airlines are almost certainly going to respond to with aggressive adjustments. Any flights between the US and Canada (going either way) are at risk of cancellation and/or significant schedule shifts. (And yes, potentially deep discounts...if the flights are still on.) If you have any such flights, you would be wise to be monitoring their status in the coming weeks as airlines shift their plans (and their planes) to other places/times. Even if you have no travel planned to/from Canada - you're just going to Europe - it may impact you.
For example, if you have a trip to Europe planned for this summer, and you have a connection at a Canadian airport, watch out.
I've got a trip to Scotland coming up in July, and our flight home (to Seattle) includes a connection in YVR (Vancouver). The last leg of the trip home is just a short, under-an-hour hop from Vancouver to Seattle on an Air Canada turboprop. Air Canada flies this run (SEA-YVR) several times a day (at least they do now...), and I'm guessing that if demand for cross-border travel continues to collapse, this flight (like many others) is at risk. I recall during COVID, this flight was canceled completely, it just stopped.
I'll keep an eye on it (no changes I've seen yet) but in my case there's an extra risk: we are coming home on an award flight (booked with Air Canada frequent flyer miles). Our route home (all on a single booking) starts in Bergen, Norway, and goes through Frankfurt (on Lufthansa), then a nonstop from Frankfurt all the way to Vancouver (on Air Canada), then the last short hop to Seattle on Air Canada.
If the last leg from Vancouver to Seattle is canceled, Air Canada would put us on the next available flight (the next available flight might not be until the President Alexandria Ocasio-Cortez administration, and I'm not sure I'm going to live that long...). But if the SEA-YVR route is dropped entirely...then things might just get really complicated/messy, ie a re-routing through Toronto or someplace else back east. Hopefully Air Canada doesn't just give up on me and leave us stranded in Norway.
Mine is an edge case, not applicable to most here, and something I'll be watching. But if you have (or are contemplating) any travel between the USA and Europe which involves a connection in Canada (lots of flights do) then you should also be keeping an eye on your booking to make sure it doesn't go sideways. Flight options between the western US and Europe (which often connect in Toronto) may become more complicated or more limited as the US/Canada flights dwindle. So if you are planning flights between the US and Europe, just be aware that any routing with a connection in Canada has a higher risk of a flight schedule/routing change (because the US-Canada leg may be canceled or switched to a smaller aircraft). Good luck.